scholarly journals Taste the Bass: Low Frequencies Increase the Perception of Body and Aromatic Intensity in Red Wine

2019 ◽  
Vol 32 (4-5) ◽  
pp. 429-454 ◽  
Author(s):  
Jo Burzynska ◽  
Qian Janice Wang ◽  
Charles Spence ◽  
Susan Elaine Putnam Bastian
Keyword(s):  
New Zealand ◽  
Cultural Production ◽  
Exploratory Study ◽  
Red Wine ◽  
Low Frequency ◽  
Sine Wave ◽  
Pinot Noir ◽  
Practical Application ◽  
Low Frequencies ◽  
Frequency Sound

Abstract Associations between heaviness and bass/low-pitched sounds reverberate throughout music, philosophy, literature, and language. Given that recent research into the field of cross-modal correspondences has revealed a number of robust relationships between sound and flavour, this exploratory study was designed to investigate the effects of lower frequency sound (10 Hz to 200 Hz) on the perception of the mouthfeel character of palate weight/body. This is supported by an overview of relevant cross-modal studies and cultural production. Wines were the tastants — a New Zealand Pinot Noir and a Spanish Garnacha — which were tasted in silence and with a 100 Hz (bass) and a higher 1000 Hz sine wave tone. Aromatic intensity was included as an additional character given suggestions that pitch may influence the perception of aromas, which might presumably affect the perception of wine body. Intensity of acidity and liking were also evaluated. The results revealed that the Pinot Noir wine was rated as significantly fuller-bodied when tasted with a bass frequency than in silence or with a higher frequency sound. The low frequency stimulus also resulted in the Garnacha wine being rated as significantly more aromatically intense than when tasted in the presence of the higher frequency auditory stimulus. Acidity was rated considerably higher with the higher frequency in both wines by those with high wine familiarity and the Pinot Noir significantly better liked than the Garnacha. Possible reasons as to why the tones used in this study affected perception of the two wines differently are discussed. Practical application of the findings are also proposed.

Infrasonic Music

2009 ◽  
Vol 19 ◽  
pp. 51-56 ◽  
Author(s):  
Cat Hope
Keyword(s):  
Low Frequency ◽  
Low Frequencies ◽  
Very Low Frequency ◽  
Frequency Sound ◽  
The Way

Low-frequency sound on the cusp of the audible offers the possibility of redefining the way we think about listening to music. As the perception of pitch is lost in very low-frequency sound emissions, an opportunity arises for a different kind of music and a different way of listening. Low frequencies can be engaged to activate responses other than the aural or be used as a kind of “silent activator,” enabling or affecting other sounds. This article explores the possibilities for what may be called an “infrasonic music.”

Open Loop Control of Combustion Instability With a High-Momentum Air-Jet

2004 ◽  
Author(s):  
Jong Ho Uhm ◽  
Sumanta Acharya
Keyword(s):  
Low Frequency ◽  
Sine Wave ◽  
Open Loop ◽  
Effective Control ◽  
High Momentum ◽  
Open Loop Control ◽  
Low Frequencies ◽  
Loop Control ◽  
Wave Modulation ◽  
Air Jet

A new strategy for open-loop control of combustion oscillations using a high-momentum air-jet modulated at low frequencies is presented in this paper. The oscillations in the swirl-stabilized spray combustor of interest are dominated by an acoustic mode (235 Hz) with a low frequency (13 Hz) bulkmode (of the upstream cavity) oscillation superimposed. The most effective strategy for control is shown to be achieved through the use of a new concept which utilizes a high-momentum air-jet injected directly into the region of flame dynamics. It is shown that with a low frequency modulation (15 Hz) of the high momentum air-jet, the pressure oscillations can be reduced significantly (by a factor of nearly 10). Square wave modulation is shown to be considerably more effective than sine-wave modulation. These results are extremely promising since high bandwidth actuation is not required for effective control.

scholarly journals Design of Multiple Parallel-Arranged Perforated Panel Absorbers for Low Frequency Sound Absorption

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2099
Author(s):  
Xin Li ◽  
Qianqian Wu ◽  
Ludi Kang ◽  
Bilong Liu
Keyword(s):  
Absorption Coefficient ◽  
Sound Absorption ◽  
Normal Wave ◽  
Low Frequency ◽  
Approximation Model ◽  
Low Frequencies ◽  
Absorption Bandwidth ◽  
Frequency Sound ◽  
Electrical Analogy ◽  
Wave Incidence

A particular structure that consists of four parallel-arranged perforated panel absorbers (PPAs) is proposed for the low frequency sound absorption within a constraint space. The apertures of the perforated panels are set to ≥1.5 mm, and the number of orifices is much less and therefore easier to be produced in comparison with that of the micro perforated panel (MPP). A simple approximation model by using acoustic-electrical analogy is described to calculate the sound absorption coefficient of such device subject to normal wave incidence. Theoretical and experimental results demonstrate that the device can provide more than one octave sound absorption bandwidth at low frequencies.

Physiology of peripheral neurons innervating otolith organs of the squirrel monkey. III. Response dynamics

1976 ◽  
Vol 39 (5) ◽  
pp. 996-1008 ◽  
Author(s):  
C. Fernandez ◽  
J. M. Goldberg
Keyword(s):  
Squirrel Monkey ◽  
Transfer Functions ◽  
Low Frequency ◽  
Sine Wave ◽  
Saimiri Sciureus ◽  
Otolith Organs ◽  
Response Dynamics ◽  
Low Frequencies ◽  
Gain Enhancement ◽  
Wave Cycle

1. The discharge of peripheral otolith neurons in response to sinusoidal force variations was investigated in the barbiturate-anesthetized squirrel monkey (Saimiri sciureus). The sine waves were superimposed on a background force which biased the end organ so as to excite or inhibit the unit's firing. Both regularly and irregularly discharging neurons were studied. 2. The response amplitude, measured as a peak-to-peak changes in firing rate, reached near-maximal values during the first sine-wave cycle and, for most units, remained constant as sinusoidal stimulation was prolonged. 3. In regular units, introduction of an excitatory bias increased the sensitivity to sinusoidal stimulation in a manner consistent with the static asymmetries observed in the response to constant forces. Bias effects in irregular units were usually small and, in some cases, excitatory biases resulted in a decrease in sensitivity. 4. Variation in sine-wave amplitude had no effect on the sinusoidal gains or phases of regular units. For irregular units, there was some evidence of a small gain increase as stimulus amplitude decreased. 5. Nonlinear distortion was usually 10-20% and was mainly of an asymmetric type. In regular units, the distortion could be partially related to static asymmetries. 6. The response of regular units is predominantly tonic, that of irregular units more phasic. For regular units there was usually no more than a twofold gain enhancement as frequency was increased in the spectrum from DC to 2.0 Hz; typically, small phase leads at low frequencies were replaced by similar phase lags at higher frequencies. Irregular units were characterized by a 20-fold frequency-dependent gain enhancement over the same spectrum; phase leads of 20-40% were seen. 7. Bodeplots were fit by a family of transfer functions, each consisting of three terms. The first is a velocity-sensitive operator with a fractional exponent. The second is a low-frequency adaptation operator. Only the lag operator can be related to the dynamics of otoligh motion. Most of the variations among units, including those seen between regular and irregular units, can be accounted for by suitable variations in the velocity-sensitive and adaptation operators. 8. The transfer functions, when integrated and inverted, led to reasonable approximations of the response to force trapezoids. It is concluded that the transfer functions provide an adequate representation of the dynamic behavior of most units. The only exceptions are the few neurons showing delayed adaptation.

Low Frequency Noise Considerations for Combustion Turbine Projects

1997 ◽  
Author(s):  
Lisa A. Beeson ◽  
George A. Schott
Keyword(s):  
Noise Control ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Pressure Pulsations ◽  
Relative Difficulty ◽  
Low Frequencies ◽  
Sound Energy ◽  
Frequency Sound ◽  
Human Ear

Combustion turbine projects have become a popular choice for providing a clean and efficient source of electricity. However, since combustion turbines generally produce low frequency sound energy, special siting considerations should be evaluated to minimize the potential for impacts on sensitive receptors, such as residences, churches, hospitals, and schools. For successful siting of combustion turbine projects near sensitive receptors, it is necessary to incorporate noise control features into plant designs to reduce not only audible noise but also noise at frequencies which are even lower than the human ear can perceive. These extremely low frequencies can rattle walls and windows, causing pressure pulsations which may be perceived by some people, or vibration of small objects inside houses and other structures. Even “quiet” plants which include extensive noise control features may still result in perceptible low frequency noise due to the relative difficulty of attenuating low frequency sound energy. Noise attenuation options are discussed, including active, passive, and reactive technologies, along with the impacts associated with each type of design. Guidelines for siting combustion turbine power generation facilities near sensitive receptors are presented, to enable development of projects which not only meet applicable noise requirements, but also reduce the potential for community complaints.

scholarly journals Investigation of Acoustic Properties on Wideband Sound-Absorber Composed of Hollow Perforated Spherical Structure with Extended Tubes and Porous Materials

2020 ◽  
Vol 10 (24) ◽  
pp. 8978
Author(s):  
Dengke Li ◽  
Zhongcheng Jiang ◽  
Lin Li ◽  
Xiaobo Liu ◽  
Xianfeng Wang ◽  
...  
Keyword(s):  
Sound Absorption ◽  
Three Dimensional ◽  
Low Frequency ◽  
Acoustic Properties ◽  
Low Frequencies ◽  
Frequency Sound ◽  
Sound Absorber ◽  
Spherical Structure ◽  
Absorption Performance ◽  
Melamine Foam

Traditional porous media such as melamine foam absorb sound due to their three-dimensional porous struts. However, the acoustic properties at low frequencies are greatly related to its thickness. In this paper, a novel type of thin and lightweight sound absorber composed of melamine foam and hollow perforated spherical structure with extended tubes (HPSET) is introduced to enhance the sound absorption performance at low frequencies. A theoretical model for the normal absorption coefficient of the HPSET with melamine foam is established. Good agreements are observed between the simulated and the experimental results. Compared with the virgin melamine foam, the proposed absorber can greatly improve the low-frequency sound absorption and retain the mid- to high-frequency sound absorption, while the thickness of the proposed absorber is less than 1/28 of the wavelength.

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